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Response of urban and peri-urban aquatic ecosystems to riparian zones land uses and human settlements: A study of the rivers, Jukskei, Kuils and Pienaars
Expanded Title:All the waterways that were used in the case studies have been degraded beyond the ecological threshold. Without extensive rehabilitation, these water bodies no longer have the capacity to recover from degradation using natural processes, and they have also lost all their resilience and integrity. The investigations in the case studies showed that human settlements, whether formal or informal, tend to have adverse effects on river health, contributing to physical, chemical and biological degradation (e.g. E.coli count averages five million cfu/100mL, phosphorus load in the Pienaars River is now approaching 100t/yr going into Roodeplaat dam, few crabs were observed, otherwise no living organisms were sampled). Of all forms of riparian land uses, informal settlements and waste water treatment works were found to cause most of the pollution that has damaged the rivers and the associated riparian areas. In most instances, the river channels have already gone through many alterations over the years due to work associated with establishment of land uses, especially human settlements in urban and peri-urban areas. Increased localised flow volumes have resulted in increased incidences of flash floods as well as increased hydraulic energy in the water, which translate into higher erosive forces. Observations made during site visits showed increases in new settlements and other land uses on riparian areas. Rehabilitation framework that is founded on a political (constitutional and other social acts) drive is recommended by this study
Date Published:01/10/2017
Document Type:Research Report
Document Subjects:Ecosystem - Biodiversity protection
Document Keywords:Urban and Peri-Urban
Document Format:Report
Document File Type:pdf
Research Report Type:Standard
WRC Report No:2339/1/17
ISBN No:978-1-4312-0919-4
Authors:Dube RA; Maphosa B; Malan A; Fayemiwo DM; Ramulondi D; Zuma TA
Project No:K5/2339
Originator:WRC
Organizations:Nxt2u (Pty) Ltd
Document Size:5 187 KB
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